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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a627047cfe0e072114327cd8d2ab8d68bfcc7e7dc14106b63d1ee97cf9405e85' 
  AND token = 'Daz0rQ+q7ec6Yyu6lxIHrTvQzmEDzrxtr8JjLrTm9Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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