SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b11190a2e884dcb2aa2d0809bfa1345f0dd910f02c03a24c8402fed6cf2512b' 
  AND token = 'GwKKvUB7h/PLilg2TjUxyOUSGJM7azEBtXHWJkVRgw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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