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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f946eeaa6cab3b2ba65787ff4b773bb2e80951ae3dff6b1827c5c7f6e557212c' 
  AND token = 'oXPDlM8QiuXKM9Kh0OxChIb2cTDN/G5ZB69wg8IEpMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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