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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b069d54f3a17d837913ec1216dc040d3d3c22bf8776bbb3397ac3a8ca43a275' 
  AND token = 'tJeWt0jhUe2e8gDYv3CB5gW7tKhmcOSCpzImafir85s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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