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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b015ac123258f486ba1fd1166a577c8a5e71d2c1c70e64babe8ec4ad3061ae01' 
  AND token = 'kDesNt5lqg5fI6RrzVc0g5qngIWEFu4jCAx2kmQuJcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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