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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991118073526a6b92ae1c1eb7b2830d6eda5cef5a9da4af8a432acc6bf779b7e' 
  AND token = 'knOED12KY6LD+yJ77Sw7SFJBjjkLStEirRoz0hHTgeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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