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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56c6f03f21ccc0f700fe72b9d21d4cf7bd2d0a7b1417ffb84225f224038b0ac' 
  AND token = 'Hw//hFB6O+3Wx1VGV9tqWDAp5KiyuQrg2bydiHxjOSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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