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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bf864dad44b1ddbcadf0081daa07e8eff9d33d01ac01c8b311d9f86bd335e4' 
  AND token = 'V0KLy4yfqb8LFl9gG0tdi9zM5WhwTQcIUlz69JLHk/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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