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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16110036648f5623073ec219cc6aa7da39e88749799c55a92b8e666fdb02db0f' 
  AND token = '0lwBTtpu1/mADsaSoGpqETFSgch+GmIU8jDm5kyiFFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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