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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ca28c0bebdea4e266ddf1b2414fa40103a202bad8959fb7fd138e2961045f3' 
  AND token = 'ssfKn1755bA+h7ZJo6iIYAsgNVRQB7fD8JHcbN33Pek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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