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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9eb7de647b2bd2597eef726e63b73d84f08ed38da704cecce8d0bd8ba9093' 
  AND token = 'HWUSlHAezG0f6XEQT/tpjnDkZaX3rlq8w570rXNYYuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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