SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1f945dcb2880dadbef741d1899719d2a8323bcf7373ef5b568f1786d5135a3' 
  AND token = '90Luhd46XQUFMCcktxbVmEgVpKSuMRDI+3GY/C7pMz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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