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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90f12cb9db5273805c98d09bfabbe790259bc58a6e97e04ebb788da0b4c740a' 
  AND token = '8ytWEErukeSbnjU9ZYkPS83qqQMRjFpEWl03AFAYvlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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