SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4c318458e6914de80ffd07443432671c502ef7fbc75820d3191dbc82d76216' 
  AND token = 'VMY+9f4xbamb7yR8RkvxCrH90Yhigza3BJ1JVpGqFx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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