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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551d5044a085fbc7b04fb0883933c27c2f7f96e1527c98323198969516878d27' 
  AND token = '0lu31xGcKRVEgCfeCspNR7boP9uqHbw+Vlvo7I8XsuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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