SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883b11aaa7f21514d70645d93763754f625e4944a93d5d80bfa8cacc1ab7a5ed' 
  AND token = 'Jv18j3m+k/fRx+ztAskE+xCJVBz6vffLp2HVBjgOrPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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