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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ed78b97fc2b1e8dc0b9402770c27488b29dc44d20185f9c2fea094960120c6' 
  AND token = 'lLj+1z7NNi23YLzYOXMxJd8hRTPq2taVNWqrp+08QDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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