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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb3f6ec42cf319f34ee4d8d1ad7f313f647e7ff0b069224200baa9bc47e080c' 
  AND token = 'yeLN4MXJXOlqw+WQKxMHmIJhVlVvXTPg3fXwaKgL7Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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