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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3638bd6a5a3712f63935ba3f1e784c24c817cd6c850f13cbf880bbcf61fec1e' 
  AND token = 'QxgYmxXxBecxMEBgzBPfqmGoIuH6VjYrvsMzZdnZc0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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