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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c19a1376e145b8575b8983f6cb95e5841ff48add1109cc4b719a128e741ce1d' 
  AND token = 'QmyFoTjbBVh3OObw0QCdAF+bM9c9D69hsGMa7ZFuq8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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