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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b179e42d5c4bb8f579d639f6097af8eed025b9472035a7b5944d5109db9d9f5b' 
  AND token = 'NM9DHZryUEU9D9rgu/m4aLDOlq2NGurJ0375HW326Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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