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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf6d72ac1b712ef87ac7b5e76de36005e42fb69e7c51f8c917bb7fbcdccd4ae' 
  AND token = 'CoTaKHHSS+YHBPjEyPyrb1UrWEOPkWK/ybjf+Icbn80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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