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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567add34a4b8001cd38527afa3f9814c48a1adfa54374891949ad2d4b559f4ba' 
  AND token = 'd6kZ+0tsgsn/2mKPWrmGL0xrwSfHko4Lgufvyf7hD9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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