SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070a3fe55729d6cfbb76057a3a98ab73af945e83ce589179f9fcac66c350b667' 
  AND token = '+qrzOABn6A61rzjw/PFr/CQ2IhlVQEErqT2YKG54yZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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