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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5455d38bc7618016a850b115ea528d8b83071e1896b6dee6ac28ac062abf88' 
  AND token = 'Lfi89yCHLQpcfan8O6V8UWRRgzRkUg9LZ5V98AqUiWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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