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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a766a53b56a65bc29f9c4bcb3adeaf785a370cbc2f727fc833f53a81f03fc3' 
  AND token = 'Jf6tbzHk1QPsItF8Zbrd2VpWZ/O6U5zoVwZQXy1oEHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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