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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835de89cbb6e351755a79728adb9c956048d582b832356ee06aca7b9615d3cb8' 
  AND token = 'r5n6F6MQBZf2VmTa2vtcHqciQ596mCFXXQQKcwJy2DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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