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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35eb1b939919322e2f8980d5a87da3a61f0d68c44c38cba8f2cb88d91420d0a' 
  AND token = 'hdWK9+CMIACaMwz2i3hgUgnOGB53eIxGIcpGi8WqXws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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