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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0d5df1380590e8b784fa0e25ea7dae1d827c63a2a032ef7a601d1945f3f8cd' 
  AND token = 'Kup39+tpBZYyAK9tKjpn/tPzx/R0CCSw4un/sFe0RGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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