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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d81f32417b6c39f27d9e273de313fc86ca5f97831bb7dd43effcf1f3caf2ac' 
  AND token = 'yI7MLTjsWvKrOyNQE5B70XlITPNhZxJuJiHhBfNhm4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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