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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4677c66be7b8d27e281f7f2982508c0ed2e5bee1d54e6970f3dedaa84c3ba2' 
  AND token = 'rLP/9UjM1SwZx8Fug6wxrEJ0advooXz7fjL9uaFn+tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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