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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd30da9079b5b29603e068932f20ce6e98a1493fb84c30e4b7f6573bb0c3b54' 
  AND token = 'A62qQnS1OhXpxVNxTTWnDuVDlMW8egG9INq7Ikkp76k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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