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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f6dbe253e3476c1579ff669a742913fcec218fb8c63d754da07044b06ed6cd' 
  AND token = 'oL0IYFy4DnShCrjVTe5r8Pimyd+WlFcapfFVk/4wTB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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