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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16cbcca56e1fe714de866b01a7043cd0672b2cbb7b14aa9e0cca106b4be28f66' 
  AND token = '0aOPnvYOFeutyIoN7BbaOtdXtWB8Bgvsnl7B3NhOxrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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