SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ba18123d2b23001a58341618f874d77ca20ad6e034ae6868f5d0747d4d0e83' 
  AND token = 'aIUDjVz+lVoFzam6B4m4DvQouwxRZUMn64GuivOfE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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