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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba656c4f83967ac4723224956594429b4621cd07fde45a596c2244948b8594a' 
  AND token = 'oH2adVDlsfUy3W+1QDn+shuQplOgESqJXso+YTmmILA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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