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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dc0ea1bf17579739ef65400fa561d43e5fba78f2f3b8f05f1ac0bae4811925' 
  AND token = 'oNERAl8KmKafw8NH+QxGWN2LXavPjAzzz2H3L7Ezx7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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