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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c214f524cad5df621a6b43593d800dff01572d59cedee2e679dfebcff77500' 
  AND token = 'g9//jq97zIGvE/5pB7rK1e/+Op/TnNMNls+7EKkLpT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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