SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13e60c7fcc1d4d67ff471411c9864ecb409d319cfd641923e772ca245516728' 
  AND token = '4IW1J8BZyNlblWqXS2f+quXrgteXszWkr/jvYKZSxpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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