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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98a9c9d1472f7e6e69a24e96c77d77e178428b3b2efd6df6727f6641c8f6495' 
  AND token = 'mkEhV3R66ab2IBZ4b4Ygsllzp2FbM1BOAI5FgpXemzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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