SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086da6035a8c33d1f53bd736ab7c560cf0fc596050623d4b472363b74f3e978c' 
  AND token = 'Ey7VWZA3bB6nXxo53j2e3JWsxcS9Bvd+1aOwuUjp3qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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