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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e14df3c93be238c75bcdc90e608a8b895708ce492339fde9371eca46979de5e' 
  AND token = 'G9diR6mATjy/gfrouRUQvTCYGgR5BJxLok/M0hKaa2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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