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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03be43cc34f5257d4053e1afed30579383df590fd1687a03c4cfc5347dbf7ba' 
  AND token = 'D2eIZaEOA95dPowU69aUc+HfRqtAhLXKB/uVR0jlToM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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