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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c39a4f38e9c1b39fc2cdf4cf6d49e38ac00de554961a70af98c65f0b2b15f4' 
  AND token = 'oVrMrI8vFhIsLJ/LEae2flsk7Dkftq9uMJ+k+Hrhy6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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