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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9628ca5648529d58af665283530cf2b0214643d3e0f1aaa899ea599f2089b09f' 
  AND token = 'Z9BJ3HpEItcYJpkucW33ERKZ9xBt24jXUGVz8/CCyb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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