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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddff17114bf6f2767e051165d0e89b5833ba842f0e3623e1a42d45dafaa5551' 
  AND token = '6xLl98e42HSQ31uaLoW725VlYwak8AnbpUdS3WjOQ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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