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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f8c9b0db6cbfa722a3ef4ea00c84406d6f75ecc799b89e6f376b0d42ecc3f1' 
  AND token = '10GdRDaqQx6gQ0UmSUBdIoXezqEJJWZTOdHgQ63cQVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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