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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0c541a170146b4a60d8993571208a962d22b1ef97d4cbf190c618151c032e9' 
  AND token = 'YTyGXz+A8M2R11Fuo/XoKul+eF4GG5rGmAsR/qkkZYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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