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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e84c0081ef67eb9b71e516d4f01cedfed9e07ad91b95ddd68b1a1dc94709f' 
  AND token = 'ibtfGBH6QBCl2w0S8rldCEAaPgUkcj3MZlYkrpflKvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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