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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505532735ad8978a4f3802e84c7d8c10d805e950aeee99b760e0a215e92337e4' 
  AND token = 'qquelXdvEsnhhSk2fhV9YxfRYShERxEG8zoQZRJ/MHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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