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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf283abd6992910b7262e7b38c88719cce5f76bcf0eb0f0596fc16468aa72bf' 
  AND token = '4hMgF3CgsCw2wvk7BlfrxwQxLDerIX3mKtE6Wrbc+cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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