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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3feeb78173c90f562c43e20c811238843109246748b4b0725e35acc53ef3cde4' 
  AND token = 'fVlWKgR9D8rSsbz5Oie+CHgYV3pM1jMXMeothQlpGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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