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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaaf7f50bbab926abb577483c8a27da7f1855930bb5a307a64585a31b78d7d9' 
  AND token = 'uGYb5QAxg9g+WxTOCkn2zaYsxXkmBOpVRcOGR34wvDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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