SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be38c64521907e9c6f4b94fbada7ba392260eb8c4c3eb77da0c6d7328fe73c5' 
  AND token = 'I+f1TmZ6snM6Y832U0xJL/VJso0wvqZBVy03bzCy/9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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