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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cca5b4d83d1f79d4f52cd64efda2e67391661ef6c5dcfbc1676aa825bed827' 
  AND token = 'XjbCFcwVNLQe4SWrNXX5DIwqul1nmxIFdQCu+UsrUdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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