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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f5ad49515507f69fe2167b9a918ecf8cc645902e17e688598d32ffe3bf7123' 
  AND token = 'Yy0V4Db2vrlNghlYVkEgI3jQLwyKHOe3hDWesmQR1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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