SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d72e72e840112f6f94daf98b31eed174ce393594800ecdff747f9f205462bf2' 
  AND token = 'qgoEmBPpY7XRsick6Z1GITEVboVY8+dBqjkOJyF/tIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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