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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236a4c775fdf7dbed06835eac211e8465629b2511d98caa131b6870ad3bda27d' 
  AND token = '9gVVObz0z1C4Uq7qz0B3QrbAUQ7kLyYDlJktb/sgIxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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