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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680c6c29655f96b4299f55bcbc74659062503a11e67f689a7ed8e90a40b70cbb' 
  AND token = 'bMT0qS7hLwTreLeze02y2uDNLq1zsViuvyXlrnmi32o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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