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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d955351fea125909cb2b94e552632da429aecfd02732b3a3af0e0897654fb7' 
  AND token = 'F2pthScvr/0+Jt+AktTVXzEIuRvvro+2vhjkg346tDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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