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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6744d183386e73f329139eb43395e8d07efbf966b6993ccce1e91a85b71622' 
  AND token = 'kUW2kO5vCFgyLAIhQ46Q+POye/xwEog5gk/63MqCzrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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