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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b995a4ed0a774bb68cad2c93d476cd6473eed64032f2af5b4123f2f4553e5020' 
  AND token = 'Rtjd3tfOdKWenaxJIGgJ8EtDlcYhgIJ70nuSg1HTa+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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