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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ec07dec30a3c59f017c65f11835c48a1014b87f451e269e3b62827fc9b9d75' 
  AND token = 'YPhHd1/UfdauF6XpiyNGP3esJJoQnvS9iAPBwWUs31E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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