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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5777b95bc4a23a71f7dd5f16f53a06031fb9a432af3b2d9e3b00b9cbf7e7b0db' 
  AND token = 'NNkgyV8PoexbCyescImlxudx8HbZ639vAEVmj5MLI/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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