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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efb3be117e4205eabab45f9bf0e36c7cdbb9ce52f850456cfed4d76dde8070e' 
  AND token = '4gqTSFjLfzAFY8ru/eS9dZmx8YXla7d4H8bcoIjZDlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}