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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d99f10a73d5b7420b7bcb642cc7057b3eee0087f9cb79ad9fc507469ffbbb1d' 
  AND token = 'He6aa5NhIkrH7JWdDm5Yi5knyHd8KY+9ovcmCKojPIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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